215652621696 has 128 divisors (see below), whose sum is σ = 603294748800. Its totient is φ = 68064841728.

The previous prime is 215652621649. The next prime is 215652621713. The reversal of 215652621696 is 696126256512.

215652621696 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-3 number, since 3×215652621696³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16066380 + ... + 16079796.

It is an arithmetic number, because the mean of its divisors is an integer number (4713240225).

Almost surely, 2^215652621696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215652621696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301647374400).

215652621696 is an abundant number, since it is smaller than the sum of its proper divisors (387642127104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215652621696 is a wasteful number, since it uses less digits than its factorization.

215652621696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15656 (or 15644 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 51.

The spelling of 215652621696 in words is "two hundred fifteen billion, six hundred fifty-two million, six hundred twenty-one thousand, six hundred ninety-six".